Fluid-flow meter.



H. H, MAPELSDBN.

FLUID PLOW METER.

- APPLICATION FILED JULY 16, 1909. 1,076,437. Patented Oct. 21, 1913. L 2 SHEETS-SHEET 1.

F'igJ.

Witnesses: Inventor:

" Harold H.Ma|:e| de,n,

v o ltty,

H. H. MAPELSDEN.

FLUID FLOW METER.

APPLIOATION FILED JULY 16, 1999.

1,076,437. Pafinted 001;.21, 1913.

F. 2 SHEETS-SHEET z.

Inventor: -WiLnesses: v Harold H.'M a|aelsden.

n. unnrsnnn,

ELECTRIC COMPANY, A CORPORATION OF N.EW..YOBK..

. m rnurn rnowimnrna.

To all whom it may concern; Q s

.Be it known that I HAnom'H. Mavens nun, a citizen of the Ilnited States, residing at Schenectady county of Schenectady, State of New ork, 'have inyented certain new and useful Improvements in Fluid- Flow Meters, of which the following is a specification. I y

This invention 'relates .to that class of fluid flow-meters in which a Pitot tubeis employed in combination with a U-shaped mercury tube, the tube being mounted on pivots so that it can tilt and impart movement to suitable indicating or recording mechanism. s

The present invention has especial refer.- ence tothe mechanism by which the movements of the tilting tube are caused to actuate the devices that show or record thefquantity of fluid flowiifib Stated briefly, e tube is geared to a movable band, preferably an endless belt, carrying the recording pencilor marker which moves transversely of the traveling record sheet. The gearing actuates a weight acting on an arm whose efiec'tive' radius can be varied by a device responsive to the,pres-.

' uprig 'tion in a vertical plane.

and the cups contain .a "body of mercury 8,.

sure of the 'fiuid, so thst the record will be correspondingly efiected.

In the accompanying drawings, Figure 1 is a ,front elevation of my improved meter;

Fig. 2 is a cross section on the line 2 2,

Fig. 1; Fig. 3 is a vertical section on the line 3-3, Fig. 2, and Fig. sis adetail of the pressure compensatin device.

The customary di erential' res-sure devices in the fluid-conveyin con uitare connected b the pipes 1, 1 and the -flexible coiled tn s 2,2 with the upper ends of the tube, consisting preferably of two U-sha t cups 3, 4 connected at their lower ends by a hollow bar 5. The cups 3, iare supported by a beam 6 which is mounted on suitable bearings 7 so that it will stand normally horizontal but is capable of oscilla- .The hollow bar k which-fillssaid cups toe convenient height,

other-framework of the apparatus. A #6 gear 14 is secured to the shaft 11 meshes;

say about halfway.

Attached to the beam .6 is a segment gear '9 conpehtricwith. the T, and meshing with a pinion on a shit lljournaled in a frame 12 attached to the standard 13 or spur Specification of Letters Iatent. Application filed m 16, 1909. Serial No. 507,944.

with a pinion 15 .16. A movable pencil-carryin band is at-' tached to said-pulley,preferab y an endless belt 17; passing around an idler pulle '18, mounted on the frame 12, and so p aced that the lower reach of the 'belt-is-parallel with the axis of a cylinder 19 on which the or seamen, new Yoax, nssreuonro enunm- Patented 00ft. 21', 1 913.

on the shaft of a. belt-pulley g'gaduated record sheet'is mounted; Aspinin the pulley 1 6 engages with said beltand prevents it fromslipping. Apencil 21 fastened-to the support 22 which pivots on the belt presses li'ghtl sheet. 'Aclock 23 drives t e cylinder 19 ataneven rate of speed. An arm 24 depends'substantially vertically from the rear end of'theshaft' 1'1. Resting againstit is a weight 26,- onthe end of a rod 26 passing up througha stationary guide 27, in line with the axis of the shaft l1 and provided'with rack teeth 28 meshing with a gear wheel 29. A pinion 30 on the shaft of said gear'wheel meshes with a sector gear 31 which is adapted to be turned'by a pressure-responsive\device, preferably two oppositely-acting 'Bourdon tubes- 32 Whose free ends are connected by links 33 to points oncpposite sides of the center of said sector on the record gear, and whose fixed ends communicate by d a pipe 34 with the pipe 1 leading from the high pressure Pitot tube in the fluid conduit. he operation is as follows: The rapidly 'flowingfiu'id in the conduit sets up a difier cntial pressure in the pipes 1, 1, that in the former being the greater, so that a portion of the mercury 8 in the cup 3 is driven .over into the cup 4. This causes the beam to tilt downward to the left, and the segment gear 9 rotates the pulley 16 by-means' of the .pin-

ions-10, l5 and the spurgear 14;the movementof the segment gear'being greatlym'uh tiplied, preferably A small fluctuation in flow will therefore cause a considerable travel of the belt 17 andthe pencil 21. The record sheetis of such widthas-to take a wide'vari'at-ioncf flow, and the pulley 16 is preferably ofsuch a diameter that a half revolution will carry the w oil from oxie side of the sheet to the I :other. When the segment gear 9 rotates the it thereby imparts angular movement to the arm 24; This movement tends to swing the weight 25 upward, and the turning-moment required to su'lt depends upon the angular departure of theerm 24 from the vertical, and also upon the distance of the weight from the axis of the shaft 11; the shorter the distance, the

less being the; energy required. Now an increase in the static pressure of the fluid whoseflow isbeing metered will, if said fluidis elastic, increase the'mass of the fluid passing in a given timea-t a predetermined constant velqcityLl In order, therefore, to obtaln an accurate record, the variations in pressure must be provided for. Th1s is'ac-v complishedj in the present instance by the Bourdon tubes 32, which upon an increase in the static pressure in the pipe 1 tend to straighten out, and thus turn the sector gear 31, thereby rotating the gear wheel 29 andliftingthe' weight so that the effective length of'the arm 24 is shortened and its turning moment is enabled to carry the weight through a greater angular travel'.'.

conduit.

with the apparatus which I now consider to represent the best embodiment thereof; but I desire'to have it understood that the ap- 'means. 7

paratus shown. is only illustrative, and that the invention can be carried out by other l-What I claim as new and desire to secure by LetterslPatent'oftheUnited States I lifluid flows meter having a substantially ll-shapedmercury tube, a pivot on which the tube is-mounted tdti'lt, mechae;- A. fluid "at rater having a' t-iltingf thQQiipSflti') differential pressures created by in'g, gearing-between the pivot and said mechanism, and means responsive to changes in the static pressure of the fluid being metered that cooperates with said gearing to modify the actionof said mechanism to com- 'pensate for" static pressurefchanges. v 2. A fluid flowgmeter having-a substantially U-sha'ped mercury tubemountfdtotilt, aipivot'forlthe tube, a segment gear. that -:1I 1 oves;wi th-thetube about the j pivot, "a

driven by,:the'gear, 'a record-in mechanism-,- earin between the shaft an :said mecha-J shaft nism;,'-aand.mean s responsiveto change the stat ressure of the ,fluid being me I H cooperates with he gearing ta modifyfthe action of -the '1' dingfmechw nism to compensate fo tic presu1te changes. I

beam,flmer'cur'y cupsbarried on.-,the ends of.

the beam, a conduit 'connecting"'the ch 5,}

means for subjecting them to diifi'erent ial pressures created by the flowing fluid; a re-j cording mechanism, gearing' 'arranged in the;

spacebetween the cups thatis actuated by I the static pressure. of the fluid being meteredithatcoiiperates with the gearing to modify the action of the recording mechanism to compensate" for? static pressure changes. u

,4. A fluid flow meter having a tilting beam, mercury cups carried on said beam,

ated by the flowing fluid mechanis'm for recording, the movements of said beam, means for transmitting motion from the movedby said beam,.a weightengaged by said arm, and a pressure-responsive device weight alon said arm.-

recording mechanismactuated by said gearing, a normally vertial arm rotatable by said gearing, a weight hangingadjacent to aid arm, apressure responsive device, and means actuated thereby for varying the radial distance of said weight from the axis of rotation of said arm.

6. A fluid flow meter having a tilting for connectingsaid cups, a segment gear. on said beam, ashaft driven by said gear, recordin mechanism geared to said shaft, a

1 norma y vertical arm on said shaftila rod passing through the axis of said s aft, a weight on said rod bearing againstsa-id arm, and a motor device actuated by the pressure of the fluid and operating to raise and lower said rod. Y

horizontal beam, mercury cups dependingfrdm the ends of the-beam, conduit means pivot for the beam arranged between its the flowing fluid, a segment gear extending downward from the pivot into the space be tween the cups, ashaft arallel to the pivot,

segment-gear, and mechanism for showing from the pinion,

connecting: theg-lowerpontailtlms of the .cups,

,ithe -fflowin'g fluid,'fa segment gear extending downw ard'ff rom the pivotintothe space pivot, a pinion on the shaft t at meshes with the beam and in turn actuates said"mecha.--

nism, and means. responsiveto'changes -weightactii1g on the'arm, adevice responveto-the pressure of the fluid: that moves ,7. A fluidvflow' meter having a normally .gonnectingthe lower portionsof the cups, a

ends, *means for subjecting the mercury in. i the cups to differential pressures created by a-pinion on thegshaft t at meshes with the ithe iquantity of fluid flowing that is driven Q B; A fluid flow-meter having a-normally a .givot for the beam ;arr ged between its en s, .,.means;rforgsubjecting the mercury in flietween, the; cups, a shaft 'arallel to the.

means forconnecting said cups, means for I subjecting them to difl'erential'pressures crev beam to said mechanism, an arm angularly 5. A 'flui flow meter having a tilting mercury tube, gearing actuated by said tube,

beam, 'mercunycups carried thereon, means horizontal beam,'me'rcury,cups depending from theends of; the beam,'conduit means a :thdsegnient gear, an arm on the shaft, a,

. 80 actingflto vary the point of contact of said the weight along the arm a; the pressure varies, and a recording mechanism-driven from the pinion.

9. A fluid flow meter having a normally horizontal beam, mercury cups depending from the ends of the beam, conduit means/ connecting the lower portions of the cups, a pivot for the beam arranged-between its ends, means for subjecting the mercury in the cups to difierential pressures created by the flowing fluid, a segment gear extending downward from the pivot into the space hea segment gear,

'tween'the cups, a shaft parallel to the ivot,

a gear on t 

